Hill's Prescription Diet Canine Metabolic Plus Mobility is the first clinically proven dog food that provides help for both joint care and weight management. You can see improvements in mobility in as little as 21 days, with a reduction in body weight by 13% in 60 days, all clinically proven. Key Benefits: Nutrition clinically proven to support the metabolism of joints. Contains Glucosamine & Chondroitin Sulphate. The use of EPA to maintain healthy cartilage in dogs exemplifies Hill's leadership in pioneering fatty acid technology. Nutrition clinically proven to reduce body weight. 88% of pets fed this nutrition lost weight at home in two months. The nutrition in Metabolic + Mobility is clinically proven to work with dog’s unique energy use. Helps avoid weight regain following weight loss. Fresh Pack System to preserve fatty acids and maintain quality. When healthy weight is achieved, feeding amounts need to be adjusted to maintain ideal weight.